samba - Jun 2004 - smbclient authentication with Suse 9.1

I have Samba 2.2 running on a Suse 8.1 box.  
  
 I have just built a 9.1 client and want to use Samba authentication. It all 
set up very nicely in YAST (saw the domain and joined the domain) but I cannot 
log in. Domain users are not appearing at the logon prompt and, if I try to 
type user name and password, I get no success.  
  
 I am convinced this is a problem on the client side as we have a number of 
other clients authenticating correctly - Win XP, Win NT4 and Xandros.  
  
 Help please